lib/util.h

   1 /** \file util.h
   2  *  \brief Header: various utilities
   3  */
   4
   5 #ifndef MC_UTIL_H
   6 #define MC_UTIL_H
   7
   8 #include "lib/global.h"         /* include <glib.h> */
   9
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <inttypes.h>           /* uintmax_t */
  13 #include <unistd.h>
  14
  15 /*** typedefs(not structures) and defined constants **********************************************/
  16
  17 #ifndef MAXSYMLINKS
  18 #define MAXSYMLINKS 32
  19 #endif
  20
  21 #define MAX_SAVED_BOOKMARKS 10
  22
  23 #define MC_PTR_FREE(ptr) do { g_free (ptr); (ptr) = NULL; } while (0)
  24
  25 /*** enums ***************************************************************************************/
  26
  27 /* Pathname canonicalization */
  28 typedef enum
  29 {
  30     CANON_PATH_JOINSLASHES = 1L << 0,   /* Multiple `/'s are collapsed to a single `/'. */
  31     CANON_PATH_REMSLASHDOTS = 1L << 1,  /* Leading `./'s, `/'s and trailing `/.'s are removed. */
  32     CANON_PATH_REMDOUBLEDOTS = 1L << 3, /* Non-leading `../'s and trailing `..'s are handled by removing */
  33     CANON_PATH_GUARDUNC = 1L << 4,      /* Detect and preserve UNC paths: //server/... */
  34     CANON_PATH_ALL = CANON_PATH_JOINSLASHES
  35         | CANON_PATH_REMSLASHDOTS | CANON_PATH_REMDOUBLEDOTS | CANON_PATH_GUARDUNC
  36 } CANON_PATH_FLAGS;
  37
  38 enum compression_type
  39 {
  40     COMPRESSION_NONE,
  41     COMPRESSION_GZIP,
  42     COMPRESSION_BZIP,
  43     COMPRESSION_BZIP2,
  44     COMPRESSION_LZMA,
  45     COMPRESSION_XZ
  46 };
  47
  48 /*** structures declarations (and typedefs of structures)*****************************************/
  49
  50 /*** global variables defined in .c file *********************************************************/
  51
  52 extern struct sigaction startup_handler;
  53
  54 /*** declarations of public functions ************************************************************/
  55
  56 int is_printable (int c);
  57
  58 /* Quote the filename for the purpose of inserting it into the command
  59  * line.  If quote_percent is 1, replace "%" with "%%" - the percent is
  60  * processed by the mc command line. */
  61 char *name_quote (const char *c, int quote_percent);
  62
  63 /* returns a duplicate of c. */
  64 char *fake_name_quote (const char *c, int quote_percent);
  65
  66 /* path_trunc() is the same as str_trunc() but
  67  * it deletes possible password from path for security
  68  * reasons. */
  69 const char *path_trunc (const char *path, size_t trunc_len);
  70
  71 /* return a static string representing size, appending "K" or "M" for
  72  * big sizes.
  73  * NOTE: uses the same static buffer as size_trunc_sep. */
  74 const char *size_trunc (uintmax_t size, gboolean use_si);
  75
  76 /* return a static string representing size, appending "K" or "M" for
  77  * big sizes. Separates every three digits by ",".
  78  * NOTE: uses the same static buffer as size_trunc. */
  79 const char *size_trunc_sep (uintmax_t size, gboolean use_si);
  80
  81 /* Print file SIZE to BUFFER, but don't exceed LEN characters,
  82  * not including trailing 0. BUFFER should be at least LEN+1 long.
  83  *
  84  * Units: size units (0=bytes, 1=Kbytes, 2=Mbytes, etc.) */
  85 void size_trunc_len (char *buffer, unsigned int len, uintmax_t size, int units, gboolean use_si);
  86 const char *string_perm (mode_t mode_bits);
  87
  88 /* @modifies path. @returns pointer into path. */
  89 char *strip_password (char *path, int has_prefix);
  90
  91 /* @returns a pointer into a static buffer. */
  92 const char *strip_home_and_password (const char *dir);
  93
  94 const char *extension (const char *);
  95 char *concat_dir_and_file (const char *dir, const char *file);
  96 const char *unix_error_string (int error_num);
  97 const char *skip_separators (const char *s);
  98 const char *skip_numbers (const char *s);
  99 char *strip_ctrl_codes (char *s);
 100
 101 /* Replaces "\\E" and "\\e" with "\033". Replaces "^" + [a-z] with
 102  * ((char) 1 + (c - 'a')). The same goes for "^" + [A-Z].
 103  * Returns a newly allocated string. */
 104 char *convert_controls (const char *s);
 105
 106 /* overwrites passwd with '\0's and frees it. */
 107 void wipe_password (char *passwd);
 108
 109 char *diff_two_paths (const char *first, const char *second);
 110
 111 /* Returns the basename of fname. The result is a pointer into fname. */
 112 const char *x_basename (const char *fname);
 113
 114 char *load_mc_home_file (const char *from, const char *filename, char **allocated_filename);
 115
 116 /* uid/gid managing */
 117 void init_groups (void);
 118 void destroy_groups (void);
 119 int get_user_permissions (struct stat *buf);
 120
 121 void init_uid_gid_cache (void);
 122 char *get_group (int);
 123 char *get_owner (int);
 124
 125 /* Check if the file exists. If not copy the default */
 126 int check_for_default (const char *default_file, const char *file);
 127
 128 /* Returns a copy of *s until a \n is found and is below top */
 129 const char *extract_line (const char *s, const char *top);
 130
 131 /* Error pipes */
 132 void open_error_pipe (void);
 133 void check_error_pipe (void);
 134 int close_error_pipe (int error, const char *text);
 135
 136 /* Process spawning */
 137 int my_system (int flags, const char *shell, const char *command);
 138 void save_stop_handler (void);
 139
 140 /* Tilde expansion */
 141 char *tilde_expand (const char *);
 142
 143 void custom_canonicalize_pathname (char *, CANON_PATH_FLAGS);
 144 void canonicalize_pathname (char *);
 145
 146 /* Misc Unix functions */
 147 int my_mkdir (const char *s, mode_t mode);
 148 int my_rmdir (const char *s);
 149
 150 /* Creating temporary files safely */
 151 const char *mc_tmpdir (void);
 152 int mc_mkstemps (char **pname, const char *prefix, const char *suffix);
 153
 154 #ifdef HAVE_REALPATH
 155 #define mc_realpath realpath
 156 #else
 157 char *mc_realpath (const char *path, char *resolved_path);
 158 #endif
 159
 160 /* Looks for ``magic'' bytes at the start of the VFS file to guess the
 161  * compression type. Side effect: modifies the file position. */
 162 enum compression_type get_compression_type (int fd, const char *);
 163 const char *decompress_extension (int type);
 164
 165 GList *list_append_unique (GList * list, char *text);
 166
 167 /* Position saving and restoring */
 168 /* Load position for the given filename */
 169 void load_file_position (const char *filename, long *line, long *column, off_t * offset,
 170                          GArray ** bookmarks);
 171 /* Save position for the given filename */
 172 void save_file_position (const char *filename, long line, long column, off_t offset,
 173                          GArray * bookmarks);
 174
 175
 176 /* if ch is in [A-Za-z], returns the corresponding control character,
 177  * else returns the argument. */
 178 extern int ascii_alpha_to_cntrl (int ch);
 179
 180 #undef Q_
 181 const char *Q_ (const char *s);
 182
 183 gboolean mc_util_make_backup_if_possible (const char *, const char *);
 184 gboolean mc_util_restore_from_backup_if_possible (const char *, const char *);
 185 gboolean mc_util_unlink_backup_if_possible (const char *, const char *);
 186
 187 char *guess_message_value (void);
 188
 189 /*** inline functions **************************************************/
 190
 191 static inline gboolean
 192 exist_file (const char *name)
 193 {
 194     return (access (name, R_OK) == 0);
 195 }
 196
 197 static inline gboolean
 198 is_exe (mode_t mode)
 199 {
 200     return (gboolean) ((S_IXUSR & mode) || (S_IXGRP & mode) || (S_IXOTH & mode));
 201 }
 202
 203 #endif /* MC_UTIL_H */